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Anonymous users2024-01-24Oils and fats are divided into fats and vegetable oils, so those rich in oils and fats are;
Inorganic salts refer to carbon-free compounds, including carbon oxides, carbonic acid, carbonates, and the main component of table salt is sodium chloride, which is an inorganic salt;
Metal materials include pure metals and alloys, and iron pans are made of ferroalloys;
The main component of scale is calcium carbonate, which can react with acetic acid in vinegar to generate soluble calcium acetate, water, and carbon dioxide, so vinegar can be used to remove scale on the gallbladder wall of the hot water bottle
So the answer is: ;
a. Sucrose is an organic matter, and organic matter is generally composed of molecules, so the choice is wrong b. The main component of table salt is sodium chloride, which is an ionic compound composed of sodium ions and chloride ions, so the choice is correct >>>More
A. Flour is insoluble in water and cannot be formed evenly with water. >>>More
Answer A: This question examines the classification of organic matter. The main ingredient of baking soda is sodium bicarbonate, which belongs to the category of inorganic substances. Edible oil is oil, vinegar is carboxylic acid, and sugar is sugar.
There is no new substance generation in the juice squeezed by B, so it is a physical change, and there is a new substance generation in apple rotting and kitchen knife rusting, which is a chemical change, so B. is chosen
B.Boiling water boils, this is just the water temperature reaches 100 degrees and continues to absorb heat so it boils, of course, 100 degrees water does not boil without heating. Although water changes from liquid to gaseous, its chemical structure remains unchanged. >>>More